If you have Python 2.x installed, start this file: wifi_speed_test_server.py

If you have Python 3.x installed, start this file: wifi_speed_test_server_python3.py

Only one thing is left, you should start WiFi Speed Test application on your mobile device and connect to your computer running wifi_speed_test_server.
The simpliest way is to click on browse button to find the server. If it does not work then use this method:

To get the the local IP address of this computer, just execute the following command:
ipconfig and get the value of "IP Address" field (on local network this IP address should be in either 192.168.X.X or 10.X.X.X form).

Example (in this example you should give the 192.168.20.2 as server in the WiFi Speed Test application. If you don't find this settings just scroll down in the application.):

c:\Users\pzole\AndroidStudioProjects\tcpserver>"c:\Python27\python.exe" wifi_speed_test_server.py --help
Usage: wifi_speed_test_server.py [options] [tcp_port]
Options:
--version show program's version number and exit
-h, --help show this help message and exit
-v, --verbose Verbose mode
-b BROADCAST, --broadcast=BROADCAST
The broadcast IP address
-e SOCKET_RCV_BUF, --socket-rcv-buf=SOCKET_RCV_BUF
The minimum size of the socket receive buffer. If the
system default is higher that will be used. Usage: -e
131072 or -e 128K
-s SOCKET_SND_BUF, --socket-snd-buf=SOCKET_SND_BUF
The minimum size of the socket send buffer. If the
system default is higher that will be used. Usage: -s
131072 or -e 128K
-u UDP_PORT, --udp-port=UDP_PORT
set udp port